Write the reaction equation: Ch4-CO2-CaCO3-CO2-H2CO3-CO2

1. Combustion of methane.

CH4 + 2O2 = CO2 + 2H2O.

2. Obtaining calcium carbonate.

CO2 + Ca (OH) 2 = CaCO3 + H2O.

3. Thermal decomposition reaction:

CaCO3 = CaO + CO2.

4. Formation of carbonic acid when carbon dioxide dissolves in water.

CO2 + H2O = H2CO3.

5. The decomposition reaction is reversible to acid formation.

H2CO3 = CO2 + H2O.

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